crypto: arm64-aes - fix encryption of unaligned data
authorMikulas Patocka <mpatocka@redhat.com>
Fri, 25 Jul 2014 23:40:20 +0000 (19:40 -0400)
committerHerbert Xu <herbert@gondor.apana.org.au>
Mon, 28 Jul 2014 14:01:02 +0000 (22:01 +0800)
cryptsetup fails on arm64 when using kernel encryption via AF_ALG socket.
See https://bugzilla.redhat.com/show_bug.cgi?id=1122937

The bug is caused by incorrect handling of unaligned data in
arch/arm64/crypto/aes-glue.c. Cryptsetup creates a buffer that is aligned
on 8 bytes, but not on 16 bytes. It opens AF_ALG socket and uses the
socket to encrypt data in the buffer. The arm64 crypto accelerator causes
data corruption or crashes in the scatterwalk_pagedone.

This patch fixes the bug by passing the residue bytes that were not
processed as the last parameter to blkcipher_walk_done.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
arch/arm64/crypto/aes-glue.c

index 60f2f4c..79cd911 100644 (file)
@@ -106,7 +106,7 @@ static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
        for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
                aes_ecb_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
                                (u8 *)ctx->key_enc, rounds, blocks, first);
-               err = blkcipher_walk_done(desc, &walk, 0);
+               err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
        }
        kernel_neon_end();
        return err;
@@ -128,7 +128,7 @@ static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
        for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
                aes_ecb_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
                                (u8 *)ctx->key_dec, rounds, blocks, first);
-               err = blkcipher_walk_done(desc, &walk, 0);
+               err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
        }
        kernel_neon_end();
        return err;
@@ -151,7 +151,7 @@ static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
                aes_cbc_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
                                (u8 *)ctx->key_enc, rounds, blocks, walk.iv,
                                first);
-               err = blkcipher_walk_done(desc, &walk, 0);
+               err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
        }
        kernel_neon_end();
        return err;
@@ -174,7 +174,7 @@ static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
                aes_cbc_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
                                (u8 *)ctx->key_dec, rounds, blocks, walk.iv,
                                first);
-               err = blkcipher_walk_done(desc, &walk, 0);
+               err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
        }
        kernel_neon_end();
        return err;
@@ -243,7 +243,7 @@ static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
                aes_xts_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
                                (u8 *)ctx->key1.key_enc, rounds, blocks,
                                (u8 *)ctx->key2.key_enc, walk.iv, first);
-               err = blkcipher_walk_done(desc, &walk, 0);
+               err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
        }
        kernel_neon_end();
 
@@ -267,7 +267,7 @@ static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
                aes_xts_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
                                (u8 *)ctx->key1.key_dec, rounds, blocks,
                                (u8 *)ctx->key2.key_enc, walk.iv, first);
-               err = blkcipher_walk_done(desc, &walk, 0);
+               err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
        }
        kernel_neon_end();